Terabytes to Gigabytes Converter

About the tb to gb calculation

One terabyte is exactly 1,000 gigabytes, so converting between them is a single multiplication. Enter any value above and the result updates as you type. Decimal terabyte — 1,000,000,000,000 bytes. Decimal gigabyte. This is why a "1 TB" drive shows as roughly 931 GB in your operating system.

Formula

GB = TB × 1,000

1 TB = 1,000 GB
1 GB = 0.001 TB

Worked example

To convert 1 TB, multiply by 1,000: 1 × 1,000 = 1,000 GB.

Frequently asked questions

How many gigabytes are in a terabyte?

There are 1,000 gigabytes in one terabyte. To convert any amount, multiply the number of terabytes by 1,000.

How do I convert gigabytes back to terabytes?

Divide instead of multiplying, or equivalently multiply by 0.001. One gigabyte is 0.001 terabytes.

Is this conversion exact?

Yes, provided both sides use the same convention. Decimal units (KB, MB, GB) are powers of 1,000 and binary units (KiB, MiB, GiB) are powers of 1,024. Both are exact — the confusion comes from software labelling binary values with decimal names.

Where is each of these units used?

Terabytes: decimal terabyte — 1,000,000,000,000 bytes. Gigabytes: decimal gigabyte. This is why a "1 TB" drive shows as roughly 931 GB in your operating system.

Sources

• IEC 80000-13 — binary and decimal prefixes for information units